table web ex3

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <table border="1" style="width: 100%;">
        <tr>
            <td>1</td>
            <td>2</td>
            <td>3</td>
        </tr>
        <tr>
            <td>4</td>

            <td>
                <table border="1">
                    <tr>
                        <table border="1" style="width: 100%;">
                            <tr >
                                <td>1</td>
                                <td rowspan="2">1</td>
                                <td>1</td>
                                <td rowspan="2">1</td>
                            </tr>
                            <tr>
                                <td>2</td>
                                <td>1</td>
                            </tr>
                            <td colspan="3">1</td>
                            <td>1</td>
                        </table>
                    </tr>
                </table>
            </td>

        </tr>


    </table>
</body>
</html>